Chen Zili Cheng Qingwen Xu Yungcong Zhang Jinwen Syntax Analysis of Fuzzy Logic System <i>FL</i><sub>1</sub> and Its Derivations <i>DFL</i><sub>1</sub>, <i>MFL</i><sub>1</sub>. 89-98 1992 conf/iwar/1992 IWAR db/conf/iwar/iwar1992.html#ZiliQYJ92